1. Heat grill to medium-high. In a small bowl, combine the pineapple, jalapeño, lime juice, and ¼ teaspoon salt. Set aside.
2. Form the beef into four ½-inch-thick patties and season with ½ teaspoon each salt and pepper.
3. Grill the patties (do not press or flatten), 3 to 4 minutes per side for medium-rare.
4. Place the burgers on the buns and top with the pineapple salsa.
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